I am working on a ASUS PB2-LS. Everything works fine except for the onboard
Adaptec 7890 SCSI controller.
When the SCSI BIOS scan begins, it does not see any drive. It makes three
attempts to find a drive, which takes it 2.5 to 3 minutes before it
fails, and then continues with the boot. It does this even if there is no
drive or cable plugged in. With no drive or cable plugged into the
controller, the result is the same, ... a two and a half minute scan. With
no cable plugged in, the SCSI BIOS device scan should take no more then 5
seconds. And when I use CTRL-A to enter the SCSI BIOS it takes around 45
seconds for it execute.
I have tried it with a SCSI drive plugged in. The scan tries to find a
drive for 3 attempts which goes on for 2 and half minutes, and there is no
way to stop it. After the scan failed with the drive, I removed the SCSI
drive and cable. Then I disabled the onboard SCSI and plugged my AHA
2940AU into the Asus,...then plugged the cable into the 2940AU and powered
on. There it is .. the drive is seen and works normally. It is not the
drive, it's not the cable.
The first thing I did to troubleshoot this, was to clear the BIOS, and
flash it to the latest ASUS posted version. This ASUS flash updated both
the BIOS and the SCSI BIOS. But I have the same problem.
Next I pulled everything out of the board, and pulled the board from the
case. I then pulled and shorted the battery. and then I let it sit
overnight, before hooking it back up on the bench with basic components,
....CPU, RAM, Video, Floppy. As soon as I powered on I entered the BIOS
loading defaults..exited out and as soon as the SCSI BIOS started I entered
it and loaded defaults.
Then I powered off. When I powered back on I had the same problem. There
was no SCSI drive connected and yet the SCSI device SCAN took 2 min 37 sec.
It took 47sec just to enter the SCSI BIOS. I then powered off and plugged a
known to be working TEAC SCSI CDROM and cable. Powered on, made BIOS
adjustments and rebooted. Same problems.
The Adaptec Controller is probably toast, but Is anybody familiar with this
Adaptec onboard controller, and has anybody seen this sort of behavior
before. Anybody know of a solution?
Thank You
Rode
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